As you are most likely aware, XNA is a .Net wrapper around the C++ based directX bindings. .. so my thinking is that if XNA is not updated when they remove the old math library (and MSFT just said they would not), that effectively kills it, or worse, math just got a lot harder to figure out for game development for the noobs. Am I communicating clearly? If not, I apologize.
You're missing a point on the previous page - XNA has not just suddenly ceased to exist. You can still use it. It's still a supported platform. It just won't be updated in future, but that's no reason to suddenly declare it off-limits for anything. It's still there, it still works, you can still use it